A hydrocarbon filter for storm drains binds oil and fuel sheen at the catch basin, not the outfall. Learn how Ultra-Urban® Filter inserts and Smart Sponge® media intercept hydrocarbons, metals, and other priority pollutants at the source.
A hydrocarbon filter for storm drains is a passive media insert placed inside a catch basin or deck drain that binds oil, fuel sheen, and dissolved hydrocarbons before runoff reaches an outfall. Abtech Industries supplies this through the Ultra-Urban® Filter, loaded with Smart Sponge® media, sized to drop into existing infrastructure without pumps, power, or excavation.
Where Do Hydrocarbons in Storm Drains Come From?
Hydrocarbons reach a storm drain network from many small, continuous sources rather than a single spill: vehicle drips in parking lots and fleet yards, tire and asphalt wear, atmospheric deposition from exhaust, fueling operations at gas stations and marina docks, and industrial wash-down areas. Airports concentrate hydrocarbon loads further through jet fuel handling, deicing operations, and ground equipment. Once runoff hits pavement, hydrocarbons show up in two forms — free-floating oil that rises as a visible sheen, and emulsified or dissolved hydrocarbons that bind to fine sediment and stay suspended in the water column. A standard catch basin sump traps coarse sediment and floating debris, but it has no mechanism for capturing the dissolved fraction — that passes through untouched and reaches receiving waters.
Why the Catch Basin, Not the Outfall, Is the Right Place to Intercept
Permit holders operating under NPDES and MS4 programs must demonstrate measurable pollutant reduction at regulated discharge points, which creates a natural instinct to focus treatment at the outfall — that is where inspectors measure. But a single paved catchment, whether a highway shoulder, airport apron, or port terminal, can shed hydrocarbon loads through dozens of catch basins before a single gallon reaches the outfall pipe. Treating only at the outfall means every upstream basin has already discharged untreated runoff into the conveyance system, and the treatment burden at that single point becomes costly and operationally complex. Intercepting hydrocarbons at each catch basin distributes the treatment load across the network and makes measurable reduction achievable without major construction — the reasoning behind outfall hydrocarbon capture as an upstream, not end-of-pipe, strategy.
How the Ultra-Urban® Filter and Smart Sponge® Media Work
The Ultra-Urban® Filter is sized to fit directly into a standard catch basin or deck drain opening without excavation or structural modification. Once seated, it routes incoming runoff through Smart Sponge® media before discharge. The media is hydrophobic and oil-loving: it binds hydrocarbons into a stable solid on contact rather than absorbing and releasing them, so it keeps working without wringing out or active regeneration between service intervals. Because no pumps or power are involved, installation is a drop-in operation — no trenching, no electrical work, no extended construction window. This same media behavior is what makes Smart Sponge® floating hydrocarbon booms effective at channel mouths, outfalls, and marina fueling docks where boom geometry, not an inlet insert, is the right interception point.
Can One Insert Address Contaminants Beyond Hydrocarbons?
Different sites present different contaminant mixes, and Smart Sponge® media formulations can be selected and combined within a single Ultra-Urban® Filter to match them. Smart Sponge® HM targets heavy metals including lead, mercury, arsenic, chromium, zinc, and copper — relevant for metal recycling yards, fabrication shops, and similar industrial catchments where dissolved metals show up in a discharge sample alongside oil. Smart Sponge® Plus targets bacteria for sites with elevated E. coli or coliform concerns, Smart Sponge® Quanta™ is engineered to capture PFAS, and Smart Sponge® AC adsorbs organic compounds that contribute to total organic carbon (TOC). Sediment and TSS media round out the lineup for suspended solids. Pairing formulations inside one insert avoids adding a second structure for a second pollutant. This is distinct from a civil oil water separator, which relies on gravity settling: that approach works for free-phase oil and grease but does not bind dissolved or emulsified hydrocarbons and does nothing for heavy metals, nutrients, bacteria, or PFAS — the contaminants increasingly named in MS4 and NPDES discharge monitoring.
Frequently Asked Questions
Will a hydrocarbon filter for storm drains fit my existing catch basin without modification?
The Ultra-Urban® Filter is sized to the basin and drops into place without excavation or structural modification, so municipalities, DOTs, and industrial sites can deploy across a drain network using standard maintenance crews.
Does Smart Sponge® media need cleaning or regeneration after capturing hydrocarbons?
No. The media is hydrophobic and oil-loving, so it binds hydrocarbons into a stable solid on contact and continues functioning between service intervals without mechanical wringing, washing, or active regeneration.
Can a passive insert handle high storm flows without bypassing?
Can one insert target hydrocarbons and heavy metals or bacteria at the same time?
Yes. Smart Sponge® HM, Plus, Quanta™, and AC formulations can be selected and combined within a single Ultra-Urban® Filter, so one insert can address hydrocarbons alongside heavy metals, bacteria, PFAS, or TOC depending on the site's contaminant profile.
Does a hydrocarbon filter for storm drains guarantee MS4 or NPDES permit compliance?
No single product guarantees permit compliance. Smart Sponge® media supports measurable pollutant reduction and permit targets by intercepting hydrocarbons and other priority contaminants at the catch basin, but compliance depends on the full site program and inspector requirements.
How do I start an evaluation for my site?
Share your site conditions, contaminants, treatment goals, or project plans and Abtech's team can evaluate the application, select the appropriate media, and determine whether testing or a pilot program is needed — a member of the team responds within one business day. You can also request a Site Assessment directly.